How to auto-format code in Eclipse?

On Windows and Linux : Ctrl + Shift + F

On Mac : ⌘ + ⇧ + F

(Alternatively you can press Format in Main Menu > Source)

Another option is to go to Window->Preferences->Java->Editor->SaveActions and check the Format source code option. Then your source code will be formatted truly automatically each time you save it.

CTRL + SHIFT + F will auto format your code (whether it is highlighted or non highlighted).

This can also be done at the Project Level: In the Package Explorer, right-click on the project > Properties > Java Editor > Save Actions

This might be preferable when working as a team so that everyone's code is saved with the same format settings.

Notice: It did not format the document unless I corrected all mistakes. Check your file before pressing CTRL + SHIFT + F.